New Twiddle

components.table-list.js

import Ember from 'ember';

export default Ember.Component.extend({
  tableMode: Ember.computed('mode', function() {
    return this.get('mode') === 'table';
  }),
  mode: 'table',
  actions: {
    toggleMode() {
      const mode = this.get('mode');
      
      if(mode === 'table') {
        this.set('mode', 'list'); 
      } else {
        this.set('mode', 'table'); 
      }
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  items: [
    { name: 'a', value: 1 },
    { name: 'b', value: 2 },
    { name: 'c', value: 3 }
  ]
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#table-list items=items as |item tableMode|}}
  {{#if tableMode}}
    <tr>
      <td>{{item.name}}</td>
      <td>({{item.value}})</td>
    </tr>
  {{else}}
    <li>{{item.name}} ({{item.value}})</li>
  {{/if}}
{{/table-list}}
<br>
<br>

templates.components.table-list.hbs

{{#if tableMode}}
  <table>
    <tbody>
      {{#each items as |item|}}
        {{yield item tableMode}}
      {{/each}}
    </tbody>
  </table>
{{else}}
  <ol>
    {{#each items as |item|}}
      {{yield item tableMode}}
    {{/each}}
  </ol>
{{/if}}

<button {{action "toggleMode"}}>Toggle</button>
  

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}